Nah Tolkien didn’t really borrow myths from other subaltern cultures.
He explicitly created his universe to be an aggressively English (read: combining Irish, Celtic, Scottish, German, etc based mythologies) mythos constructed within a Catholic hermeneutic (original sin, Heaven, Morgoth as Satan, etc) while also indulging in some of his personal sociopolitical beliefs (Industrialization Bad, Village Life is the apex of goodness).
The worst he did was the “Orcs are Mongols and Dwarves are Jews and all the Bad Evil Humans are from the East and South and have Dark Skin” which he aggressively later regretted.
(and lucky don’t feature much in any of the stories, at all, literally unseen lmao)
100%.
And that includes developing an ideally Solar-based “mysterious supreme being” for the Horde. Which, while it’s much too late for the playerbase to develop an attachment to such a being (An’she, Belore, have them be the same force, whatever), it at least provides with “Aha! Horde also has a mysterious cosmic super power that is worshipped on multiple planets!”